最简易的搜索框控制器
@interface ViewController ()<UITableViewDelegate,UITableViewDataSource,UISearchControllerDelegate,UISearchResultsUpdating>
@property(strong,nonatomic) UISearchController *searchController;
@property(strong,nonatomic) UITableView *tableView;
//数据源
@property (strong,nonatomic) NSMutableArray *dataList;
@property (strong,nonatomic) NSMutableArray *searchList;
@end
@implementation ViewController
#pragma mark 搜索控制器的懒加载
-(UISearchController *)searchController{
if (!_searchController) {
_searchController=[[UISearchController alloc]init];
}
return _searchController;
}
#pragma mark 表格的懒加载
-(UITableView *)tableView{
if (!_tableView) {
_tableView=[[UITableView alloc]init];
}
return _tableView;
}
- (void)viewDidLoad {
[super viewDidLoad];
self.title=@"搜索控制器";
// Do any additional setup after loading the view, typically from a nib.
_dataList=[NSMutableArray array];
_searchList=[NSMutableArray array];
//产生100个数字加三个随机字母
for (int i=0; i<=100; i++) {
NSString *testString=[[NSString alloc]init];
testString=[NSString stringWithFormat:@"%d%@",i,[self shuffledAlphabet]];
[self.dataList addObject:testString];
};
[self setControllers];
}
#pragma mark 设置搜索控制器的属性
-(void)setControllers{
//表格的创建
self.tableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 0,[UIScreen mainScreen].bounds.size.width ,[UIScreen mainScreen].bounds.size.height)];
self.tableView.delegate = self;
self.tableView.dataSource = self;
self.tableView.separatorStyle = UITableViewCellSelectionStyleNone;
//UISearchController的创建
//创建UISearchController
self.searchController = [[UISearchController alloc]initWithSearchResultsController:nil];
//设置代理
self.searchController.delegate = self;
self.searchController.searchResultsUpdater= self;
//设置UISearchController的显示属性，以下3个属性默认为YES
//搜索时，背景变暗色
self.searchController.dimsBackgroundDuringPresentation = YES;
//搜索时，背景变模糊
self.searchController.obscuresBackgroundDuringPresentation = YES;
//隐藏导航栏
self.searchController.hidesNavigationBarDuringPresentation = YES;
self.searchController.searchBar.frame = CGRectMake(0, 0, self.searchController.searchBar.frame.size.width, 44.0);
//添加到searchBar到tableView的header
self.tableView.tableHeaderView=self.searchController.searchBar;
[self.view addSubview:self.tableView];
self.definesPresentationContext = YES;
////这个一定不能写，不然就会导致背景色不一致
/// [self setEdgesForExtendedLayout:UIRectEdgeNone];
}
#pragma mark 产生100个数字加三个随机字母
- (NSString *)shuffledAlphabet {
NSMutableArray * shuffledAlphabet = [NSMutableArray arrayWithArray:@[@"A",@"B",@"C",@"D",@"E",@"F",@"G",@"H",@"I",@"J",@"K",@"L",@"M",@"N",@"O",@"P",@"Q",@"R",@"S",@"T",@"U",@"V",@"W",@"X",@"Y",@"Z"]];
NSString *strTest = [[NSString alloc]init];
for (int i=0; i<3; i++) {
int x = arc4random() % 25;
strTest = [NSString stringWithFormat:@"%@%@",strTest,shuffledAlphabet[x]];
}
return strTest;
}
//设置区域的行数
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
if (self.searchController.active) {
return [self.searchList count];
}else{
return [self.dataList count];
}
}
//返回单元格内容
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *flag=@"cell";
UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:flag];
if (cell==nil) {
cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:flag];
}
//如果searchController处于活跃状态，表格显示的数据为self.searchList
if (self.searchController.active) {
[cell.textLabel setText:self.searchList[indexPath.row]];
}
else{
[cell.textLabel setText:self.dataList[indexPath.row]];
}
return cell;
}
#pragma mark - Table View Delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// 注销展示结果页的搜索,才能让控制器pop或者push
[self.searchDisplayController setActive:NO animated:YES];
[self.navigationController popToViewController:popVc animated:YES];
}
#pragma mark 更新表格的显示结果
-(void)updateSearchResultsForSearchController:(UISearchController *)searchController {
NSLog(@"---updateSearchResultsForSearchController");
NSString *searchString = [self.searchController.searchBar text];
NSPredicate *preicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS[c] %@", searchString];
if (self.searchList!= nil) {
[self.searchList removeAllObjects];
}
//过滤数据
self.searchList= [NSMutableArray arrayWithArray:[_dataList filteredArrayUsingPredicate:preicate]];
//刷新表格
[self.tableView reloadData];
}
#pragma mark - UISearchControllerDelegate代理
//测试UISearchController的执行过程
- (void)willPresentSearchController:(UISearchController *)searchController
{
// NSLog(@"willPresentSearchController");
}
- (void)didPresentSearchController:(UISearchController *)searchController
{
// NSLog(@"didPresentSearchController");
}
- (void)willDismissSearchController:(UISearchController *)searchController
{
// NSLog(@"willDismissSearchController");
}
- (void)didDismissSearchController:(UISearchController *)searchController
{
// NSLog(@"didDismissSearchController");
}
- (void)presentSearchController:(UISearchController *)searchController
{
// NSLog(@"presentSearchController");
}
设置搜索框uisearchBar的背景色
[self.searchController.searchBar setBackgroundImage:[UIImage imageWithColor:DTColor(@"#F7F7F7") andSize:CGSizeMake(SCREEN_WIDTH, 64)]];
设置搜索框弹出的背景色
self.searchController.searchBar.barTintColor = DTColor(@"#F7F7F7");
这个时候会出现一条黑线，可以使用下面这个方面去掉黑线
UIImageView *barImageView = [[[self.searchBar.subviews firstObject] subviews] firstObject];
barImageView.layer.borderColor = COLOR(248,248,248,1).CGColor;
barImageView.layer.borderWidth = 1;
去掉搜索框的黑线
SearchStyle选择UISearchBarStyleMinimal，
_searchController.searchBar.searchBarStyle = UISearchBarStyleMinimal;
但用这个方法会导致背景框变的透明不推荐使用
修改光标颜色
_searchController.searchBar.tincolor = [uicolor redcolor];
